On 07/06/2016 07:16 AM, pigo wrote:
On Tuesday, July 5, 2016 at 9:18:32 AM UTC-6, Richard Henry wrote:

The mathematical formula is 100 * tan(angle) -- the tangent of the
angle multiplied by 100 to convert to percent.

In my world that's a 12/12 pitched roof. Anything over an 8 needed to
have stickers nailed down to walk on without sliding off. And 8 was
scary. Kinda depended on the distance from the edge of the roof to
the ground.

BIL was a roofer in New York. He told us about "chicken ladders".

--
Cheers, Bev
"Mr Panetta also revealed that the US Navy Seals made the final
decision to kill bin Laden rather than the president."
--S. Swinford, The Telegraph
[Aside from that minor error, those Seals did a fantastic job!] --Bev